Loss per share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net loss attributable to ordinary shareholders - basic	$ (137,933)	$ (163,324)	$ (220,327)	$ (396,234)
Net loss attributable to ordinary shareholders - diluted	$ (137,933)	$ (163,324)	$ (220,327)	$ (396,234)
Denominator:
Weighted average number of ordinary shares - basic (in shares)	957,684,820	930,455,310	956,603,250	907,231,320
Weighted average number of ordinary shares - diluted (in shares)	957,684,820	930,455,310	956,603,250	907,231,320
Net loss per share - basic (in dollars per share)	$ (0.14)	$ (0.18)	$ (0.23)	$ (0.44)
Net loss per share - diluted (in dollars per share)	$ (0.14)	$ (0.18)	$ (0.23)	$ (0.44)